<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <input type="text" >
    <button>保存名字</button>
    <script>
        console.log(localStorage.getItem('yourname'));

        let yourNametxt=document.querySelector("input");

        //TODO click 
        localStorage.setItem('yourname',yourNametxt.value)
        console.log(yourNametxt.value);


    </script>
</body>
</html>